ABAP Select data from SAP table IHOLRULE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IHOLRULE table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to IHOLRULE. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the IHOLRULE table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_IHOLRULE TYPE STANDARD TABLE OF IHOLRULE,
      WA_IHOLRULE TYPE IHOLRULE,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <IHOLRULE> TYPE IHOLRULE.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_IHOLRULE.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM IHOLRULE
  INTO TABLE IT_IHOLRULE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IHOLRULE
*  INTO TABLE @DATA(IT_IHOLRULE2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_IHOLRULE INDEX 1 INTO DATA(WA_IHOLRULE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_IHOLRULE ASSIGNING <IHOLRULE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IHOLRULE>-FTGIDRUL = 1.
<IHOLRULE>-REGELRUL = 1.
<IHOLRULE>-MONATRUL = 1.
<IHOLRULE>-MOTAGRUL = 1.
<IHOLRULE>-WOTAGRUL = 1.

ENDLOOP.

LOOP AT IT_IHOLRULE INTO WA_IHOLRULE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IHOLRULE-ABSTDRUL, sy-vline,
  WA_IHOLRULE-KONFERUL, sy-vline,
  WA_IHOLRULE-KLASSRUL, sy-vline,
  WA_IHOLRULE-GARANTRUL, sy-vline,
  WA_IHOLRULE-SORTRUL, sy-vline,
  WA_IHOLRULE-FTGIDTXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IHOLRULE you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_IHOLRULE TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_IHOLRULE INTO WA_IHOLRULE.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ISOLA, internal->external for field SPRASTXT
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_IHOLRULE-SPRASTXT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IHOLRULE-SPRASTXT.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_IHOLRULE_STR, 
FTGIDRUL TYPE STRING,
REGELRUL TYPE STRING,
MONATRUL TYPE STRING,
MOTAGRUL TYPE STRING,
WOTAGRUL TYPE STRING,
ABSTDRUL TYPE STRING,
KONFERUL TYPE STRING,
KLASSRUL TYPE STRING,
GARANTRUL TYPE STRING,
SORTRUL TYPE STRING,
FTGIDTXT TYPE STRING,
SPRASTXT TYPE STRING,
LTEXTTXT TYPE STRING,
KTEXTTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IHOLRULE_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_IHOLRULE_STR-FTGIDRUL sy-vline 
WA_IHOLRULE_STR-REGELRUL sy-vline 
WA_IHOLRULE_STR-MONATRUL sy-vline 
WA_IHOLRULE_STR-MOTAGRUL sy-vline 
WA_IHOLRULE_STR-WOTAGRUL sy-vline 
WA_IHOLRULE_STR-ABSTDRUL sy-vline 
WA_IHOLRULE_STR-KONFERUL sy-vline 
WA_IHOLRULE_STR-KLASSRUL sy-vline 
WA_IHOLRULE_STR-GARANTRUL sy-vline 
WA_IHOLRULE_STR-SORTRUL sy-vline 
WA_IHOLRULE_STR-FTGIDTXT sy-vline 
WA_IHOLRULE_STR-SPRASTXT sy-vline 
WA_IHOLRULE_STR-LTEXTTXT sy-vline 
WA_IHOLRULE_STR-KTEXTTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.